News tagged with human heart
Related topics: heart
The human heart provides a continuous blood circulation through the cardiac cycle and is one of the most vital organs in the human body. It is divided into four chambers: the two upper chambers are called the left and right atria and two lower chambers are called the right and left ventricles. Normally the right ventricle pumps the same blood amount into the lungs with each bit that the left ventricle pumps out. Physicians commonly refer to the right atrium and right ventricle together as the right heart and to the left atrium and ventricle as the left heart.
The electric energy that stimulates the heart occurs in the sinoatrial node, which produces a definite potential and then discharges, sending an impulse across the atria. The Purkinje fibers transmit the electric charge to the myocardium while the cells of the atrial walls transmit it from cell to cell, making the atrial syncytium.
The human heart and its disorders (cardiopathies) are studied primarily by cardiology.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
From the chimera in Greek mythology to the sphinx in ancient Egypt, humans have imagined making creatures from pieces of different organisms for millennia.
Medical research May 15, 2013 | 5 / 5 (1) | 0
Duke University biomedical engineers have grown three-dimensional human heart muscle that acts just like natural tissue. This advancement could be important in treating heart attack patients or in serving as a platform for ...
Medical research May 06, 2013 | 5 / 5 (3) | 0 |
Exposing skin to sunlight may help to reduce blood pressure, cut the risk of heart attack and stroke – and even prolong life, a study suggests.
Health May 07, 2013 | 5 / 5 (2) | 1
University of North Carolina researchers have discovered that disrupting a gene that acts as a regulatory switch to turn on other genes can keep blood vessels from forming and developing properly.
Medical research Apr 29, 2013 | 5 / 5 (1) | 0 |
A common nutritional supplement may be part of the magic in improving the survival rates of babies born with heart defects, researchers report.
Pediatrics May 08, 2013 | 5 / 5 (1) | 0
Taking a specific form of a vitamin E supplement can accelerate the health benefits that occur when people quit smoking, new research suggests. In the small study, improvement in blood vessel function associated with the ...
Health Apr 23, 2013 | 5 / 5 (2) | 0 |
At TEDxSydney 2013 the Professor of Genetics at Harvard Medical School shares a new concept about why we age and how it should be possible to develop medicines to reverse it.
Health Apr 23, 2013 | 5 / 5 (3) | 0
Long-term use of highly active antiretroviral therapies (HAART) does not appear to be associated with impaired heart function in children and adolescents in a study that sought to determine the cardiac effects of prolonged ...
Pediatrics Apr 22, 2013 | not rated yet | 0